Effect of MgO on chloride penetration resistance of alkali-activated binder

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The present study investigated the physicochemical characteristics of alkali-activated fly ash/slag (AAFS) modified by MgO and the influence of MgO on the chloride penetration resistance of AAFS. MgO was added to replace the fly ash and slag at dosages of 0%, 5% and 10% by weight of the binder. Samples were immersed in a 10 wt% sodium chloride solution for 91 days. The results showed that the formation of hydrotalcite was promoted by MgO incorporation. Hydrotalcite was found to be effective in improving chloride penetration resistance. However, there exists a threshold level upon which the amount of hydrotalcite may not further increase the chloride penetration resistance. In addition, the adsorption of chloride in AAFS can be seen not only as the result of effects of hydrotalcite but also as the combined effect of the pore network structure and pore solution chemistry. (C) 2018 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2018-07
Language
English
Article Type
Article
Keywords

LAYERED DOUBLE HYDROXIDES; BLAST-FURNACE SLAG; PORE STRUCTURE; FLY-ASH; ANION-EXCHANGE; CONCRETE; MORTARS; HYDROTALCITES; PERMEABILITY; STRENGTH

Citation

CONSTRUCTION AND BUILDING MATERIALS, v.178, pp.584 - 592

ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2018.05.156
URI
http://hdl.handle.net/10203/244665
Appears in Collection
CE-Journal Papers(저널논문)
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